Intermittent "lost connection to Exchange server" messages

Environment:  Windows Server 2003 & Exchange Server 2003 SP1 servers; Windows XP SP2 & Outlook 2003 clients.
My users get intermittent "lost connection to exchange server (bfnep-06)" or "lost connection to exchange server (bfnep-9)" messages while in Outlook.  After a minute or two, everything goes back to working just fine.  Some users get this when they use Outlook for the first time in a day.  bfnep-06 is my exchange server, bfnep-9 is one of my domain controllers.  Any suggestions on where to look for a solution?

Thanks!
bfnepAsked:
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abrannonCommented:
This is most likely a result of a Network issue.  I had the exact same problem, when two of my Wireless Cisco bridges were lossing there authenication.  I would check the Switch or Hub that all of these users are connected too.  Look at your Network and see were all of these users meet on the back bone.  Then check out that device.
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